21651212035 has 8 divisors (see below), whose sum is σ = 27111083040. Its totient is φ = 16567883904.

The previous prime is 21651212029. The next prime is 21651212047. The reversal of 21651212035 is 53021215612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21651212035 - 2³ = 21651212027 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21651211994 and 21651212012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94135590 + ... + 94135819.

It is an arithmetic number, because the mean of its divisors is an integer number (3388885380).

Almost surely, 2^21651212035 is an apocalyptic number.

21651212035 is a deficient number, since it is larger than the sum of its proper divisors (5459871005).

21651212035 is a wasteful number, since it uses less digits than its factorization.

21651212035 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188271437.

The product of its (nonzero) digits is 3600, while the sum is 28.

Adding to 21651212035 its reverse (53021215612), we get a palindrome (74672427647).

The spelling of 21651212035 in words is "twenty-one billion, six hundred fifty-one million, two hundred twelve thousand, thirty-five".